Solved.
My big problem is I dont have the ECU here, it is currently with Marlin.
I was using Elsawin and entering my vehicle details incorrectly.
I was putting the year as 1999 X
instead of 2000 Y
Even though my donor is an X reg.
I was thinking the code was the reg. Doh.
Once I did this I saw the ECU wiring in the current flow diagrams.
Saw the ECU had a 121 pin connector. Looked on my loom again, and spotted antoher connector hidden between the engine and the rear bulkhead, out of sight. Guess what. It has alot more pins on it !!! Havn't counted them but it has to be for the ECU.
now I just have to work out what the connector is I was looking at.
I feel a bit stupid , but hey, the problem is resolved
Thanks for all the input people !!
Cheers
Steve